Apparatus for and a method of making coils



Nov; 12, 1940. w. J. THOMPSON 3 L 0 APPARATUS FOR AND A METHOD OF MAKING COILS Filed Sept. 9, 1939 1 HI III mum/rm W J. THOMPSON A TTORNEV Patented Nov. 12, 1940 -STATES JPATENTTII OFFICE v 2,221,390 I l t APPARATUS FORAND Armrnonon 1 'MAKINGCOILS" I I William J. Thompson, Brooklyn, N. Y., assignbr to Bell Telephone Laboratories, Incorporated, New i u York, N. Y.;a.corporation of NewYork j .Y Application September 9, 1939, Serial No. 294,105

' Claims. (o1. 242-9) This invention relates to apparatus for and a method of making coils and, more particularly, to apparatus for and a method of winding and assembling fiat, spiral coils of Wire.

For some purposes and particularly for use in certain electrical devices used in the communication arts, it is desirable to have coils of insulated wire comprising a coplanar plurality of turns arranged in single-layered fiat spirals. Such coils may be useful, for example, as auxiliary windings to be associated with transformers used in various types of communication apparatus.

An object of this invention is a simple and inexpensive device for winding strand into a coil having a plurality of turns arranged in a flat spiral.

This and other objects of the invention as will appear hereinafter are attained in one embodiment of the invention which comprises", substantially, a cylindrical rod provided with a shoulder. on which the coil is to be wound. A notch across the shoulder and a small stud near the, edge of the notch provide means for holding the ends of the strand. A tubular piece fits over the rod and is attached thereto a sumcient distance from the shoulder to permit winding the coil between the shoulder and the tubular piece. After the required number of turns are wound, a thin paper disc having adhesive applied to one side is pressed on the coil to hold the turns together.

The invention will be better understood from the following description and attached drawing forming a part thereof, in which:

Fig. 1 is a front elevation of the device with one part shown in partial section;

Fig. 2 is an enlarged view partly in section showing details of a section of the device; and

Fig. 3 is a perspective of a finished coil with a part of the paper disc removed to show the turns.

Referring to Fig. 1, the device is shown mounted on a base I supported by legs 2, only one of which is shown. The device proper consists of a cylindrical rod 3 provided with a shoulder 4. The rod extends through base I and at its lower end is provided with a gear 5 or other means by which the rod may be rotated, for example, by an electric motor 6 attached to the under-side of base I.

To provide a bearing for shoulder 4 and to maintain rod 3 in a substantially vertical position two threaded bushings 1 are screwed into the base substantially as indicated.

A tubular piece ,8 1 provided with a wing-type set screw 9 or equivalent means fits over rod-3 and is held thereon at any desired distance from shoulder 4 by means of set screwB.

A pair of supports ID are adaptedto hold strand reel II from whichthe strand may be withdrawn over pulley l2 and between pulleys I3 and M. Upper pulley I4 is mounted on arm l5 to the end of which is attached a spring l6 adapted to hold pulley I4 against strand H to 10 maintain a desired tension therein.

To wind a coil, tubular piece 8 is removed from rod 3 anda spool-head l8 of insulating material is slipped over rod 3 and down until it rests firmly on shoulder 4. withdrawn and the end passed through notch IS in spool-head l8 and notch 2! in shoulder 4, and a few turns wrapped around stud 2c on shoulder 4 to anchor the strand.

One or two turns of the strand are wound 20 about rod 3 so that they rest on spool-head l8. Tubular piece 8 is now replaced on rod 3 and moved down until it rests on the turns of the strand. Tubular piece 8 is then attached to rod 3 by set screw 9. 25

Motor 6 is then started and by means of gears 5 and 22 rotates rod 3 until the desired number of turns have been wound. After the desired number of turns have been wound and the motor stopped, the strand is out near the shoulder and 30 the end passed through notches l8 and 2|, and around stud 20 to maintain the tension in a wound strand.

Tubular piece 8 is then removed and a paper disc 23, having adhesive applied to the lower side, is slipped over rod 3 and over the coil. Tubular piece 8 is then replaced and forced down on the paper disc and maintained in that position until the adhesive dries, thereby sealing the turns in position on spool-head IS. The ends of the strand which were anchored to stud 20 are then removed and the finished coil, as

shown in Fig. 2, is removed from rod 3.

While a specific form of the invention has been shown and described, it is to be understood that the invention is not to be limited thereto secure one end of a strand thereto for winding 55 A length of strand is 15 thereon, means to. maintain the strand in contact with the supporting surface while being wound to cause successive turns of strand to lie 'upon the surfacein substantially coplanar spiral relation, and means to secure the turns of the wound coil together.

2. A method of making a coil comprising winding a strand 'under atfiIlSiOti for a plurality of turns, causing the rturns of the strand to lsuca oessively build one upon the other in substantially coplanar spiral formation, and applying an adhesive material to one side of the Wound strand while under tension to hold 'thefturn's thereof against relative displacement.

3. A method of'making acoi-l icomprising winding a strand under tension for a plurality :of

turns, causing the turns of the strand to :suc

cessively build one upon the other in substantially coplanar spiral formation, applying an adhesive member to one side of the wound strand while under tension to hold the turns thereof gain t relative displacement, and compressing the wound strand. and the adhesive member to cause intimate association of the former with I the latter.

4. An apparatus for winding a coil having a substantially flat spiral winding, which apparatus comprises a rotatable support having a substantially fiat supporting surface transverse :in which said adjustable member comprises a tubular piece which fits over said rotatable support extension and which is provided with a set screw for attaching saidtubular piece to said extension.

WILLIAM J. THOMPSON. 

